The rapid development of electric vehicles and large-scale energy storage put forward higher and higher requirements on electrochemical energy sources. The key factor in this regard is the fuel cell catalyst and the material of the rechargeable battery.
Battery material structure, one for Li-ion, one is the conversion, such as the current battery anode material is the use of graphite, the capacity of commercial batteries than the demand is still not enough, the need for new materials, such as metal oxides , Silicon, etc. The problem posed by the exhaustion of these materials is that once the capacity is increased, the materials expand in volume and the volume shrinks after discharge, and any material is damaged, which is a challenge.
If the structure of the negative electrode material to make the shape of the cube, octagonal body, you can have better performance, better cycle stability.Circulation to 200 times after the failure is not exhausted, but will increase, and the usual material are different.
There are many kinds of cathode materials, its capacity is good, multi-electron reaction, light, but in fact the cathode material rate is also important, because it relates to its lithium-ion transmission, transmission channels, etc. Surface reaction time channel strength If it is large, it can be charged faster to release it. In the open structure, lithium ions can easily enter through this structure. In this sense, this has a great influence on the transmission of lithium ions.
In addition to the cathode material and the anode material inside the lithium battery, the interfacial process between various materials is also very important.Studying the interface structure evolution and reaction process of the battery from the molecular level and the microscopic structure, rationally designing and regulating the structure of the electrochemical energy source material This is especially important as a basis for significantly improving its performance.
